Lathe.



J. HARTNB'SS.'

LATHE.

'1111110111011 11111111 serine. 1911.

Patented June 3,

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LATHE.

AAPPLICATION FAILED SEPT. 6, 1911.

Patented June'3,1913

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LATHE.

APPLIoATIoN FILED SEPT. s, 1911.

\ J. HARTNESS.

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LLll Illlll 'UNITED sfrnrus,l

PATENT OFFICE.

.Turns HARTNEss, or SPRINGFIELD, VERMONT.

LATHSE.

To all whom t may concern.'

Be it known that I, JAMES HARTNESS, a citizen of the UnitedStates, andresident .of Springfield, inthe county o'f Windsor and State .ofVermont, have invented certain new and useful Improvements in Lathes,.of which the following is a specification.

This inventionfhas relation to metal-.turn- 'ing machines -in .whichslidin carriages are y head so as to secure a cross feed by moving thework relatively to the tool. In previous machines, the carriage and thehead have sliding contact with their respective ways or shears, andconsiderable power is required to .effect the sliding movement of theseparts on account of thelrvveight.

The present invention contemplates the reduction 4of the friction andreduction of the power necessary to move the parts, by providing arolling contact between the Inovable part and its ways, and it furthercontemplates provision for securing an adjust- \ment to compensate forany wear of the moving parts.

Referring to the accompanying drawings: Figure 1 represents a front sideelevationof a portion of a lathe embodying my invention, and illustratesthe portion of the bed and the Work-carrying head which is movabletransversely of the bed. Fig. 2 repre-` sents a transverse sectionthrough the bed and shows the head in end elevation. Fig. 3 represents ahorizontal section through the lower portion of the head, andillustrates the rolling Contact between the head and the ways or shearson the bed.. Fig. 4 represents an enlarged section on the line 4 4 ofFig. 3. Fig. 5 represents a section on line 5-*5 of Fi 4. Fig. 6illustrates one of the rolls' an the eccentric pin or spindle on whichit is mounted. Fig. -7 represents the pin and roller assembled. Fig. 8represents an enlarged section on line8-8 of Fig. 3. l Fig. 9 representsan enlarged section on line 9 9.

` of'Fg 3. Fig. lrepresents a section on fspecmcauon of Letters-raient.

Application tiled September 6, 1911. `Serial No. 647,873.

Patented J une 3, 1913.

.the line 10-10 of Fig. 8. Fig. 11 represents a side Aelevation ofthecomplete machine, except thatv the tools are not shown.

The same reference characters indicate the samelor snnilar partswherever they occur.

Referring to the drawings, the bed of the lathe is indicated at 11. fThis bed may be, in Substance, like that illustrated in the pat enthereinbefore referred to, and may be provided with the usualturretsupporting able longitudinally of the bed on the ways or Ishears112 provided therefor.

12 indicates the cross-slidinghead, which in the present instance isprovided with `two work-carrying spindles having chucks, indibe rotatedand fed laterally at the same time. I do not herein' claim, however, thedouble spindle construction. The bed is provided at its end, underneaththe head, with' two parallel webs 14, 14, which roject some what to thefront and rear ofp the machine',

erably cast integral with the vremainder of the bed. Heretofore the waysor shears present invention, however, I prefer toy prodicated at 15,16,17 and 18. These 'tracks are made of hardened steel and aresubstantially rectangular flat bars'or plates. Those at 15, 16, -aresetv edgewise and are doweled to one of the Webs 14 as shown in Fig. 3,being firmly secured in place by screws, the 4dowelsbeing indicated at19 and the screws at 20.

.their upper surfaces in a parallel plane with said tracks 17 aredoweled on the top of the other web 14 and are secured in'place byrscrews passed upwardly thro-ugh the web as shown.in Figs. .3 .and'9,the dowels and screws being indicated respectively at 21, 22. The fourblocks thus constitute, as I have stated, tracks or rails of hardmaterial.

The upper and under surfaces of the rails 23, 24, while the tracks 17and 18 aresimilarly engaged respectively by rolls 25, 26. These fourpairs of rolls are at the four corners respectively of the head and areinside the inclosing casing of the head so as as shown in Figs. 2 and 3.These are pref# have been formed on these webs so that the head couldslide thereon'. According to the vide separate tracks or guides, whichare 1n- The tracks 17, 18 are set -latwise but with.

15 and 16 are respectively engagedby rolls to be protected from chipsvand dust. AsA

carriage 111 (for supporting the tool) movcated at 13, so that twopieces of Work may the upper surfaces of the tracks 15, 16. The

los I shown in Figs. 3 and 4, each of the rolls 23 is rotatably mountedupon the eccentric portion a of a pin 27 which has a large head b andreduced. end c. This pin is driven friction tight into a colnplementalsocket 28 formed in the side wallof the head, and the end of the pin hasa slot (l to receive an implement by which it may be rotated to ellect avertical adjustment of the roller 23. The outer end of the socket isnormally closed by a threaded cap 29. vThe roll 24 which coacts with theroll 23v in engagement with the track 16 or the track 15, as the casemay be, is journaled upon a pin 30 driven friction tight into a socket31 and having an eccentric reduced portion on which the roll 24 ismounted. By adjusting the eccentric bearings for the rolls 23, 24, oneof the rolls` may be adjusted relatively to the other to cause the rollsto engage their respective tracks with the proper degree of pressure, or

f both rolls may be adjusted to effect a bodily adjustment. of the sideof the head.

While the rolls 23 and 24 are located in the same vert-ical plane, thoseat 25 are in different vertical planes than those at 26, as shown byFig. 8. The rolls 25 are mounted on pins 32 having eccentric portions cso that the rolls 25 may be adjusted vertically by rotating the pins 32,more or less. The sockets 33 in which said pins are mounted arenormally closed by threaded caps 34. The rolls 26 are journaled uponeccentric portions f of pins 35 which are driven to tit friction tightin their sockets but which may be rotated in one direction or the otherto effect the vertical adjustment of said rolls. The rolls 25 rest uponthe upper flat faces of the rails 17, 18, whereas the rolls 26 bearagainst the under side'of the projecting portions of said rails.

For the purpose of holding the head against movement longitudinal of thebed and the spindles due to the thrust of the tool upon the work, Iprovide two pairs of.

rolls 36, 37. These are located in proximity to those indicated at 25and 26, as shown in Figs. 8,9 and 10. The rolls 36 bear against theouter vertical sides of the tracks 17, 18, whereas the rolls 37 bearagainst the inner vertical sides. The rolls 37 are journaled on theeccentric portions g of pins 39 which are arranged friction tight insockets af forded by ears 40, and said pins may be rotated to adjustsaid rolls 37 horizontally toward or from the rolls 36. The rolls 36 arejournaled on the eccentric portions of pins 41 which have squared endsL11a by which they may be rotated in the sockets in which they fitfriction tight. The rolls and their bearings may be all made of hardenedsteel like that used for the construction ofthe tracks.

By'virtue of the construction which I have thus described, there areinterposed between the head and the tracks four rolls, and these rollsare prevented from being lifted from the tracks by coacting rolls arl`ranged immediately therebelow and engaging the under sides of thetracks, and conse- `quently they positively control the path of thecarriage while the cutter is operating upon the work. Each pair of rollsis adjustable relatively to each other to compensate for wear, and yetthey may be all adjusted so as to raise or lower the head relatively tothe tool carriage in order to compensate for any wear thatmay take placebetween the carriage and its waysA or shears. In addition, theengagement of the rolls 36 with what I may call the front sides of therails 17 and 18 holds the head against any movement due to the thrust ofthe tool upon the work, the engagement of said rolls with said railsbeing maintained by the rolls 37 which engage the inner sides of saidrails. The rolls 37 and 36 of each pair are relatively adjustable tocompensate for wear and may be adjusted in the same direction to adjustthe head transversely with reference to the tracks. Thus it will be seenthat I have provided what may be called a system of roller gibs whichenables the feeding of the head with a minimum of power and therebypermits the head to be provided with heavy gearing and adjuncts withoutadding to the manual labor of the operator in shifting the head orwithout using up power in moving it.

Although I have shown the roller gibs as being applied only to the crosssliding head` nevertheless it will be understood that I may apply themequally well to the tool carriage; but, inasmuch as an illustration oftheir application to the tool carriage would entail practicalduplication of parts already shown, such illustration is omitted.

Having thus explained one embodiment of the invention, withoutattempting to set forth all of its forms, or all the modes of its use,what I claim is:

1. In a lathe, the combination of a work support, a tool support, one ofsaid supports being movable wit-h respect to the other, a bed havingparallel rails or guideways, and rolls journaled on said movable supportand in constant rolling contact with said rails to control positivelythe path of movement of said support while the toolis operating upon thework.

2. In a lathe, the combination of a bed, parallel rails on said'bed, acarriage, rolls journaled on said carriage and resting upon said rails,and coacting rolls journaled on riage supporting rolls journaled on saidcarriage andresting upon said rails, coacting rolls journaled on saidcarriage and engaging the under sides of said rails, and means wherebysaid first-mentioned rolls and said second-mentioned rolls may beadjusted with reference to each other, substantially as set forth.

4. In a lathe, the combination of a bed, parallel rails on said bed, acarriage, rolls journaled on said carriage and `constantly resting uponsaid rails, and opposed rolls constantly engaging the innerv and outersides of said rails, substantially as set forth.

5. In a lathe the combinatlon fof a bed, rails on said bed` a carriage,eccentric pins socketed in said carriage, and pairs of coacting rollsjournaled on said pins and constantly and positively engaging oppo-sitefaces of said rails.

6. In a lathe the combination of a bed, rails affixedV to said bed, acarriage, eccentric pins socketed in said carriage, and pairs ofcoacting rolls journaled on said pins and engaging opposite faces ofsaid rails. cer-- tain of said rolls engaging the top and bottom sidesof said rails, and` certain other rolls engaging vertical sides of saidrails.

7. In a-lathe the combination of a bed, two pairs of parallel rails ofhardened steel arranged transversely at the end of the bed, awork-carrying head located above said rails, a pair of hardened steelrolls engaging the upper and under sides of each of said rails, and pinssocketed in the head and on which said rolls are journaled,substantially as set forth.

8. In a lathe the combination of a bed, two pairs of parallel rails ofhardenedl steel arranged transversely at the end of the bed, aWorkcarrying head located v above said rails, a pair of hardened steelrolls engaging the upper and under sides of each of said rails,adjustable eccentric pins socketed insaid head and on which said rollsare journaled, rolls engaging the vertical sides pf .certain of saidrails, and eccentric pins on which said last-mentioned rolls arejournaled.

In testimony whereof I have affixed my signature, in presence of twowitnesses.

l JAMEsHAR'rNEss. Witnesses G. W. CLARE, 4 J. W.' WALKER.

